ICD-10 Code G40.501 – Epileptic seizures related to external causes, not intractable, with status epilepticus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.501 – Epileptic seizures related to external causes, not intractable, with status epilepticus
What it is
This code identifies epileptic seizures linked to an external cause, when the epilepsy is not intractable and the patient is in status epilepticus. Use it for ongoing seizure activity that meets the status epilepticus definition.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include prolonged seizure activity, repeated seizures without full recovery, or clear notation of status epilepticus in a patient with epilepsy related to an external cause.
When to use this code
Use this code when the record states epilepsy or epileptic seizures are due to an external cause and the condition is not described as intractable. It also requires documentation of status epilepticus. You should confirm the external cause relationship is explicitly documented.
Do not use for
Do not use this code if the seizure disorder is intractable, if status epilepticus is not documented, or if the chart does not support an external-cause relationship. Check documentation for the correct seizure category.
Coding tip
Verify both elements—external-cause etiology and status epilepticus—before assigning G40.501.